Draw the structure of the amino acid cysteine showing the predominant form found at pH = 12.0 (assume 
NH3+ pKa 9.0; Cys pKR 8.0; 
COOH pKa 2.0).
Definitions:
Stimulant
A substance that increases physiological or nervous activity in the body, often enhancing alertness and energy.
GABA
A neurotransmitter in the brain that inhibits many of the activities of the central nervous system, thus playing a key role in reducing anxiety and stress.
Fatal Overdose
An excessive and lethal dose of a substance, typically drugs or medication, leading to death.
Heroin
Is an opioid drug made from morphine, a natural substance taken from the seed pod of various opium poppy plants, highly addictive and illegal.
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